When her fingers still refused to pull the trigger, Elle began to speak to herself internally. 'Don't be afraid… you're not going to kill an innocent… this is just training… for your sake… remember why you're doing this, Elle… remember the pain and frustration of being helpless –'
The moment when she was trembling helplessly, hiding in terror in the bushes when she saw Brandon Haze in the crowd, the moment when she was kept locked in that room, the moment when she was used as bait to capture Sebastian that night… the moment when she watched Sebastian being chained behind bars… All those helpless moments that brought up the feeling of her being useless and a hindrance just flashed like a quick slideshow in her mind. And with that reminder, Elle's arms steadied and her fingers decisively pulled the trigger.
The deafening sound that she was used to did not ring out this time, but sounds of flying bats filled the silence in the clearing they were at.